You need to have the headspace checked. A nice tight chamber is great for accuracy, but if too tight on headspace it can cause the bolt to be hard to open. When the bolt sticks it can be related to chamber pressures (hot loads). This is usually only seen when people start reloading. Try another ammo. If it works with another ammo, call BH and let them know.

__________________"Fast is Fine but accuracy is final.".....Wyatt Earp.